Detection method of damage of one-way silicon carbide fiber toughening silicon carbide ceramic matrix composite in oxidation environment

A silicon carbide fiber and composite material technology, applied in special data processing applications, instruments, electrical and digital data processing, etc. Overcome costly effects

Active Publication Date: 2013-05-08
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0007] In order to overcome the deficiency of the existing unidirectional SiC/SiC composite material damage detection method with poor precision, the present invention provides a damage detection method of unidirectional silicon carbide fiber toughened silicon ca

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  • Detection method of damage of one-way silicon carbide fiber toughening silicon carbide ceramic matrix composite in oxidation environment
  • Detection method of damage of one-way silicon carbide fiber toughening silicon carbide ceramic matrix composite in oxidation environment
  • Detection method of damage of one-way silicon carbide fiber toughening silicon carbide ceramic matrix composite in oxidation environment

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Embodiment Construction

[0026] The specific steps of the detection method for the damage of the unidirectional silicon carbide fiber toughened silicon carbide ceramic matrix composite material in the oxidizing environment of the present invention are as follows:

[0027] In the following, for a unidirectional SiC / SiC composite material subjected to an axial tensile stress of 800MPa in an air environment of 600°C and 100KPa, the material damage at different oxidation times is calculated. The radius R of the silicon carbide fiber bundle in the unidirectional SiC / SiC composite is 2 mm, and the thickness d of the carbon interface and the silicon carbide matrix is i 、d m 200μm and 800μm respectively, the width H of the matrix microcrack C The distance between adjacent microcracks, that is, the z-direction length L of the periodic microstructure is 16 mm. The performance parameters of each component material are shown in Table 1.

[0028] Table 1 Performance parameters of component materials

[0029] ...

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Abstract

The invention discloses a detection method of damage of one-way silicon carbide fiber toughening silicon carbide ceramic matrix composite in oxidation environment and aims to solve the technical problem that the prior detection method of damage of the one-way silicon carbide (SiC) / SiC composite is bad in accuracy. The technical scheme is that an oxidizing reaction kinetics equation is applied to calculate the thickness of oxidation loss of a carbon interface in the composite material microstructure oxidation process and acquire a geometric model under different oxidation times of the composite microstructure; a finite element model of the composite microstructure after being oxidized is built to conduct finite element calculation of microcosmic stress; and maximum stress strength criterions are adopted to detect damage conditions of materials. The detection method of damage of the one-way silicon carbide fiber toughening silicon carbide ceramic matrix composite in the oxidation environment is simple and high-efficiency from the molding process to the calculation process, overcomes the defects that the prior experimental method is high in cost and long in time consumption, acquires the microcosmic stress in the microstructure of the composite after being oxidized with the help of the strong finite element analysis function of ANSYS; improves accuracy of damage analysis of the one-way SiC / SiC composite and solves the problem that the mesomechanics model is low in accuracy.

Description

technical field [0001] The invention relates to a damage detection method of a silicon carbide fiber toughened silicon carbide ceramic matrix composite material, in particular to a damage detection method of a unidirectional silicon carbide fiber toughened silicon carbide ceramic matrix composite material in an oxidizing environment. Background technique [0002] Silicon carbide fiber toughened silicon carbide ceramic matrix composites (Continuous silicon carbide fiber reinforced silicon carbide composites, hereinafter referred to as SiC / SiC) have excellent properties such as high temperature resistance, low density, high specific strength, and high specific modulus, making it a One of the irreplaceable new high-temperature structural materials, widely used in aviation and aerospace engine hot-end parts, aerospace round-trip heat protection system, high-speed brakes, gas turbine hot-end parts, high-temperature gas filtration and heat exchangers, etc., its working environment ...

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Application Information

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IPC IPC(8): G06F17/50
Inventor 许英杰张卫红张清文王骏
Owner NORTHWESTERN POLYTECHNICAL UNIV
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